Nut lock for shears and the like



c. J. DALLEY Re. 21,517

NI J'I LOCK FOR SHEARS AND THE LIKE Original Filed June 24, 1936 INVENTQR flzazlesJ. p y BY Reissued July so, 1940 UNITED STATES PATENT OFFICE NUT LOCK FOB, SHEARS AND THE LIKE Charles .LDalley, Maplewood, N. J., assignor to The W. H. Compton N. J.

Original No. 2,108,654,

Shear Company, Newark,

dated February 15,1938,

Serial No. 86,946, June 24, 1936. Application for reissue November 14, 1939, Serial No.

1 Claim.

the bolt shown in elevation. Figure 2 is a bottom view of nut and the clip that locks the nut, the bolt being shown in section. Figure 3 is a top view of a modified form of lock with the nut in section. Figure 4 is a longitudinal central section through Figure 3.

In the drawing I show a blade Ill and a blade ll pivotally held together by a bolt I2, the bolt having a fiat side I3 and the hole in one blade, such as the blade I0, having a flat side M to cause the blade and bolt to swing together.

The nut I5 is screwed on to the threaded end of the bolt and has a circular part 16. The nut shown has a head I! extending beyond the circular part and having an angular edge for receiving a wrench although this head canbe dispensed with. The blade I is provided with a recess or hole l8.

A wire clip is used for locking the nut in adjusted position. The clip consists of a single piece of wire l9 formed at one end into a loop 2|) and at the other end into a stud 2|. The stud 2| fits into the recess l8 and the loop 20 encircles the circular part of the nut to hold it in adjusted positions. The circular part l6 may be provided with a rough exterior face or made irregular in other ways although a circular portion is preferred because of easy manufacture.

When the device is to be used the bolt and blades are assembled. The clip is then placed with the stud 2| in the recess l8 and the loop 20 around the bolt. The nut is then placed on the bolt and screwed down. The circular part l6, which is slightly larger in diameter than the diameter of the inside of the loop 20 engages and spreads the loop. This is easily done in the case of round wire as the first contact of the part IS with the wire loop is on the rounded part of the wire and acts as a cam in spreading the loop. As the nut is screwed down the tension by the loop increases and the function acts to hold the nut against rotatable movement relative to the bolt and relative to the blade Ill.

tension established on By this device the a pair of shears is easily regulated and such regulation is maintained.

In Figures 3 and 4 I the same as in Figures show a modified form of nut lock. In these views the bolt and nut are 1 and 2 but I provide a clip with a loop 22 which encircles the nut I and has two projecting bent to form a stud 24.

arms 23 each arm being The studs are seated in the blade l0 and while separate holes for the studs may be provided, I prefer to provide a single recess 25. The ends of arms 23 are normally apart when released and are squeezed together to place them in the recess 25, thus causing a positive and adequate frictional contact with the nut.

I claim:

clip having a loop on one end, said loop having a normal inside diameter slightly less than the diameter of the circular part of the nut, the blade having a recess in it, the wire having its other end formed into a stud toenter the recess and act to hold the clip against turning when the nut is screwed on the bolt and the circular part of the nut spreads the loop into gripping relation with the nut, said clip being of round wire so that the rounded part of the wire will act as a cam when engaged by the circular part to spread the loop and said loop being only a single turn and the nut having a head extending beyond said circular part in confining relation over said single turn of round wire and whereby free continuous adjustment of the nut in both directions and locking in all such positions of adjustment is provided.

CHARLES J. DALLEY. 

